AMERICAN PIIILOSUI'IIICAL SOCIETY. G2'.t 



striate; basal fourth rufous; feet rufous: jteetus (li.-tim tl) 

 canaliculate each side of the middle. 



Length three-twentieths of an inch. 



Note. — I am indebted to Count 3Ianncrheini of St. Peters- 

 burg, Russia, for this excellent observations on this genus. His 

 descriptions are detailed and perspicuous. I have adopted, for 

 the present, his views of this genus. 



[Also a Micvorhoijus. — Lec] 



TIIROSCUS Latr. 



T. CONSTRICTOR. 



This species is the approximate analogue of the luhtrirtin- 

 Fabr., of Europe, to which I had always referred it : but on 

 comparing our insect with a specimen of the luUtrlitor, for which 

 I am indebted to the politeness of Profc.x.sor Germar, I am in- 

 clined to consider it a distinct species, and I give to it the above 

 name, which that distinguished entomologist proposes in his 

 letter. This insect, compared with the adstrictor, is of a paler 

 color, and a little different in form ; being less attenuated be- 

 hind; in size it is much the same; it is also somewhat more ob- 

 viously puuctured. 



183G.-) 



